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The Deep Investigation of Neutral Gas Origins (DINGO) is an ongoing
deep survey of GAMA fields in HI 21 cm emission using the Australian
Square Kilometre Array Pathfinder. Roychowdhury et al. present
results from 17.7 hours of Phase I Pilot Survey observations of the
G15 GAMA equatorial field, and compare it with results from the
ALFALFA survey undertaken with the Arecibo 300m telescope. The team
measured how the atomic gas (HI) fraction (the mass in neutral
hydrogen as a fraction of the total mass of the galaxy) of galaxy
groups and pairs, taken as single units, varied with average stellar mass
and average star-formation rate, compared to isolated galaxies. From
the DINGO-based study, the mean atomic gas fraction in groups appears to
be lower compared to isolated galaxies. However, the ALFALFA-based
study reveals a substantially higher mean atomic gas fraction in
groups compared to isolated galaxies, indicating the presence of
substantial amounts of HI not associated with cataloged member
galaxies in low mass groups.
The results
have been published in the Astrophysical Journal.
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